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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ed0998146bb92ea2221f6eb35cfdb7d04e83ce11abfbba717b8abe4d79e771' 
  AND token = '8JGIzkyjoefR0a7GIGIiiriTTetsxqrQt8ePHKrcasQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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