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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b79e40723aa73cefa70c28620f3c0ce0151c2611e334dc748ecf2d84f58792' 
  AND token = 'Vq36JAYbwIeFmfOl/qk8uG5J7lEAiuO2OK9oWof9DkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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