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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be094c42449f094b1681fb797be4467cc20555848ab5ee9ea259a9fe47b0603b' 
  AND token = 'KRGuFMYZ7JMfRAkca9BTCWX9L2BspNeBZU7zJxFPSEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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