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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873aa37fd3162fcff7493279da4dc7ca3338f47d3807323e2d72cc484c5d46f8' 
  AND token = 'b1Aic2TeqF3VxW7VU5f0PyZjGQxHWiqy7mwlqRq0hc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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