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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1216defb13956ab5b580134eb633245a674ec5556cae38a8d3e5a5b7e62647ed' 
  AND token = '7tITsHkjRyKTKbdBYqzoWXrG4Vs/oufH7ljZs4qWfZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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