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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756cf7e9f63902ecf886e5dad5ae3493f6bf43df8d3f00751f29dab3a4ffbd50' 
  AND token = 'hXI1Jjm6VhzAceBL7V9ivl82jc+BO9p3011e1VZN6iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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