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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd5b2d7539d1250002e15dec297969ba47da0381c0f7a143f38ff04bd433c37' 
  AND token = '8CXRaiwjMV6u5aUlmw3s3Wk62TZjAhWrLZO67hLuO6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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