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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b7bbab31d2efabc36764a1db43a9cf8350ad03bd7945858e40abf5cb2e979e' 
  AND token = 'xiovfGfCd9Cn3HN1pGD5CQwEOyi2T0V5p+zqVIClu3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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