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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140f9adf92ce7443a035cca5641b773aefb572ae7df8869de01af6edb541b4ae' 
  AND token = 'zKkR72tI4kTroWFSR3bTe6Dajka48iT4seU/mSVqAP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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