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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f411b287d84a995625930a41db20037054391fece6477229380ed830c8d8cd1' 
  AND token = 'L2wUHkmD9zePdqMtXn1G5WsUZQf9crBf5jGFLFW7wDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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