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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5919d4ca0836ea27bcdf6e844302832228f606dc35df98a2e3a90c09090b36' 
  AND token = '5vuSR40uOjbAZDckGQjCH9hhEvoJwHRBQglxF9Mn/tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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