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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5708819f48acce3266870c5cfae9b80cbb3491f674ae36c00ab3c02323e5dde2' 
  AND token = 'xq+kO0GApNf8oRy+CgU6cnJq0rX7sAiJCzfgvS4Czt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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