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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656769f3720b8979583003444172bb5f76184453f0dda0e554b64bc8708fc266' 
  AND token = '7blUbHG3rq2Opjkai4ZeYpkbmjV9O2tzHyjZX7cwZjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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