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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8b1468c0176c7c1efeac9afeccabdf89d5c6189ff87870136774d13d44a112' 
  AND token = '/M516GesLIxxtE5+b8DNnshyWu9G2L/pbIYjIFdNYD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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