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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717ce6e26b2116a3ca367519e32e5ca12be01eaf9cbc6d74b267a6c74f4c48cd' 
  AND token = 'Y2vV0wjsG2lmpAt0lUmg63fPsdm758umugpZP7/+LhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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