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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f085c8a737db2e70be3d1eacfcf2ca9f839ae1001dfbbeb3c51b5a76df090e3e' 
  AND token = 'ALCSkdDllR+/4/hf6W8GojDH1yp26mtkmCyfEDQ+vb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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