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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb165d40a5d02b46a9a1b99296bb6444b7c77829aa7f5292e731a0832edef6b' 
  AND token = 'x2wvcfvee3jgXXfp3Uw40etkWGOwEcODswMyZy3SWrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}