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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44a163a8b74ada4babe0994aa247f07574b67442eaccea33034ee63ad9c7df3' 
  AND token = 'E+Svex6ktUz6A/aqptpgnbabSh4oZ6CkZxm68M3EkYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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