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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9fe81f3c13e82cd1721fa21632aa72adaa6b2c5a69d98464f80390d92edd83' 
  AND token = 'iJ4UT5J/2GUrcfPTiVS2PqHUsDLhiiWCs4XVnfKVnVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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