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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b459b3d3da1e97b9c314d367410f85b84eada5b0124cbfb1ee0523fbe630f9dd' 
  AND token = 'LO3AhDvk+SNv2gixRNes5aPYpP2u/DhsJtWMzf+dQG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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