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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9faa29395bb73d79fe2e8982737f52f1c1e1bb23a0a5326c59dd82a68ca9ec29' 
  AND token = 'eTPMgHQ+XNSg3aQpAOfhAV/2AuMvUd9OIZvdGRzjbSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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