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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64810dbb69f7ae8b3f97b96729f8aa1d0da7426cb917e61ff340bbfb0c4b4a2e' 
  AND token = 'jTh695NIIIB7ezAgbqbjIjwb+GVtiuzJT4PcMpmtRRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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