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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e070d68f2d5f2c300624290cd438b6eb07dc7d91fb018cf7420a8897879ec07' 
  AND token = 'Lxd4q1daVCfFfsOrcJ3+Bjyh27eT1E6ZT30MXh3uxfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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