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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a449766b106d18b8cb838094db679ce5d6a18b1efd93d8d9d89209a4514f20ca' 
  AND token = 'F70tRjsEZ4TndYvpwvHFMcavfa6/y0xXUnp5SO21aQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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