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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28c4a3afea6f7f8ff8825baa42ba965498c770cd916521f9c3f017e2361440a' 
  AND token = 'biWPfZnw67Y8vPKXo8hQz7XZJdm0Te6nF084vbG+qv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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