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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7453cdbf16a80208efaaaebb76dd87af6826b96eb51491c2b16b9d5d421c46ef' 
  AND token = 'U6Hz94E+L+0AGtvJXz/byU/mTEUvK1jvHpVreE2pD24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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