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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9413a77830a366765897a9c9e70f4cfb2aa5865e42039ee83da54a56f9640fff' 
  AND token = 'ceXptZsRK802+diKVOXHtde0H0JKIlum6YmoUAOy3KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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