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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a0c3551482b04f25bd57d1146bfb7ed33977be494187a28d6794bee3876994' 
  AND token = 'Zs/Yy+aWZ9VK8RtZgNu1SuOlJMzePtJE2aMs8qFJJxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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