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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d649443dfd18491fe1dc8c1ed336348c7c30f3515f629388bb0b3e82131f2c' 
  AND token = 'sBons165t9CwxHewfgN9GsO7jMzq9Y5R+qGvcXtKWvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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