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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c029d6955ae4d736150e5775ba8263ec88ac585073f67458dac5193afe458378' 
  AND token = 'ILGjH5/nnp7jF+VPELmqt9HF7xZeuq0gfAA5aBFgRv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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