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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c3dbe2fbdb29d5cf1db152750b1e90120f9d985c1b7a497303c0c18feb657e' 
  AND token = 'g46L71eGbhWbahmdTuuW/mN0y83ha+xrMh6z/+teWWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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