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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01970a35e96594694eb6ca54b5eefd9f972a95cc5425864caeb9260d7de9c536' 
  AND token = 'JJOI956sOHCIOFhKqPlrY/94YMCD+1iavl71cX2qa4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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