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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b06ac4990a757244295350036588c186e2ab058ddeed01947d43f15d581112e' 
  AND token = 'AL0OjeKHgSUM5TjqRrMIU0FYdwn65n1UsVa0GcBaEGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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