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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7832358bb892a53991e77c738e91173d3b7eec474ce5da115a7a66ddd61d6a62' 
  AND token = 'N9PZJu2S+aiQn/MFUdrMNTjzK+7dvclCNWUiUY1zMj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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