SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e55a0b2db4e3ad9d3127867b765f9dc8d8c71a3f5015d6c8398dcd299622104' 
  AND token = 'TVW3x/3RBCYi/ZA80RfFOs3LQz1agDBNURKjNwnNLr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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