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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcb2ff1b3fe70b2fe4fce34c65c922cf2d3ac83ad220f1a426807ea95a04e6e' 
  AND token = 'Iy882zZpZV6roXP5rvaYyQQe2DWBEqymv71n0i9BZEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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