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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae371ca875266085d1fbfbf72de77dcabb401fc17b7065ee1ec4178037bf067' 
  AND token = 'Tn7jqgVoeY69rJkQ7RBsmmcqvkEelRq0GnBM0DXBq2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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