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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c319e2109ea8e93e040a909f6d886393dd9ef3b0498a755aabaeef13ea987f2f' 
  AND token = 'cD7MeaHVX9aLsY0EJlHUV/a6JIm1qbxiCXoBqbCQHW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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