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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20995ed55a2e8aebdd5d57b87d31ab1ebe92f9bd84bbf0e764b3c93ea666c329' 
  AND token = 'CBInkX5E+AeX6gGlf4dMKIIfNlr2HqpWVDhYB0UvRs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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