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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3bafb19dbaa6e75f7c995a1a83d62edfdb9ef2a17b2d914fdc9c9c36a256e3' 
  AND token = 'o3q5k5TbETzInD2OvBjnMujwpW2yo9nd1XCR5PH5ZDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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