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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893e738710dc0d3a104bce06396af1743b788b8ab151f32dde852550e55fd6a1' 
  AND token = '5l+VnUvTlN/vdo8iAGyAFkWMSGIvQay2OPbgrq/YdXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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