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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3687de508e6d752022afd9c10152d255465d4046d80df8850b3bab1f092a0686' 
  AND token = 'Mb4mHHNKeQgWuuu2GcqTIcM9LOoFDEWZpedZO9CiH50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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