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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b636c0f9f00d83a9d7e2eb727485675410632dc5a7e2599172de5a755d55cf8c' 
  AND token = '+y2T6+rW250QGt3cwALCYkAaIcLeLahScyXwOFbm41k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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