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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89c7736eca62fa853d78f28e5c2adbab3e58aaf7d460a73cd5de77e75ceb1ed' 
  AND token = 'hAGL7mmg/F7mqqE3gp54z0TWSTd2hdr+4DKiQGI7RMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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