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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d27627290610830cb122a0edd8b9238b7dd5dadb446cceb09942f95fa0175e5' 
  AND token = 'CKPkaAeSbzxaiqcXGb5CUch1L7BJ5j4H8GUbkKK0bcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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