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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7ddd79281d92593012938fe7facea0ad740e192b604bd4929fe03775fc7b6c' 
  AND token = 'clOkS05D43Ms9Bc3zmLQWxGNxd/YzEW9kRoLs5f7YW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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