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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befd4dd69eb2366ae56d191789a5e6e6e221f35f6f1791dcde076e4680592fea' 
  AND token = 'ngK5F7KzvCF2QHhwB2Sj+zLASE621iZXBhICs27s6dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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