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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3c3c85a5586fbd133aef798578a4f026bbb63cfa2c110fd0b0394c4e14375e' 
  AND token = 'BYxUtiC1iew2o0vPrdJXJ3A2SUqMUfPkP9z2Lxab5es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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