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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0435e06d33427d8550b5da1646d70ca470cbb74e1306a4688a60b2490124da' 
  AND token = 'lz60JVKzKdO7z5BtE7V8vYRZds8rOp4Ax/DqPjwzi38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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