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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a090cabf25166155dccc769f9929094cd5144a17f3d2b5ea3adc74fc141ed0f0' 
  AND token = 'KOtn+5cLz7lD3iWACY274ICFuyemX50hXJplwdfpIHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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