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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1215f95afe28eb0a8687403533f5012b0741350ff5116937700071b971fd3e96' 
  AND token = 'MZmk4b6uBrkrcqPMIvubrxqS//6jkKeQsUwEzOl3nis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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