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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4aa90aee2aaa6342fd093ead7b34ad21cb13d997c42c90aad3e16760e0341a' 
  AND token = 'aa+lhd8HEHFvtR6l3+jEPxODc3ylomV2xWSZaJ1oi8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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