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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3b09ecd4c43b3416d6bbbb0e602593ced99e5be883634e37cebae5ad878e75' 
  AND token = 'rtCA6D90IHs9luUWET+04+VfwYVgk8SQDkfrt+kqJl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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