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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e7f97a53afbc05f3ef64cc411d5932d414591d79f4cad04c2b1b53567270c0' 
  AND token = 'k8BprJPiVbxAjos/vlTR04h8cgfAhiYJtsmGUSip3U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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