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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef2520daa2113ce1d97a0cbdf17762c9a47d440aea698190f58c7eb811b671f' 
  AND token = 'hcvPbjrM92D+Ls4T5gqF8I6PzfNsQJ4MDxQejNPhd3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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