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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e781b75e45da97d0c074ef2c0cbb72ccb77582613b6fbcdf74ec5e508345c9' 
  AND token = '2zYo2M0Rp3J8qova0EIlwupmvHlWcrmxizSbDiO8rgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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