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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8481b8deb3353914adccddac2a035856bc0c758684b1a4b7ac02070c8f1cfa' 
  AND token = '7yhMcnmPmY/czIN9rxJKY1c84IRRwRwzf/qvGFKzXaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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