SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f267b3f3b377e0d7d2d4744636cc33656580e7d1585339994ce6b92442958a3' 
  AND token = 'vPFPgCrhBDhKDPGoRiMM2H1X8J6UDew9/AFrLBg2FQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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