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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9036706df3602a31546a2e2e76248d30c10fcafaeb298011c66c8667b3e601f' 
  AND token = '+OKAiMnbLkSZ63wkM9SO7oEyOnPwlyjOG/x2In+WMds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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