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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2592d214065716a04fecec238355810b5f892e26917bffdf833f729eb488656c' 
  AND token = 'VNcIRFMcj6Iiyh80mgko/Bel1aZ7WzP2fmT+6wfURKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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